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WO2019019570A1 - Panneau à cristaux liquides à points quantiques, et dispositif d'affichage à cristaux liquides - Google Patents

Panneau à cristaux liquides à points quantiques, et dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2019019570A1
WO2019019570A1 PCT/CN2018/072994 CN2018072994W WO2019019570A1 WO 2019019570 A1 WO2019019570 A1 WO 2019019570A1 CN 2018072994 W CN2018072994 W CN 2018072994W WO 2019019570 A1 WO2019019570 A1 WO 2019019570A1
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WIPO (PCT)
Prior art keywords
pixel unit
liquid crystal
excitation light
blue
red
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Ceased
Application number
PCT/CN2018/072994
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English (en)
Chinese (zh)
Inventor
李富琳
刘卫东
宋志成
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Qingdao Hisense Electronics Co Ltd
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Qingdao Hisense Electronics Co Ltd
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Publication of WO2019019570A1 publication Critical patent/WO2019019570A1/fr
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight

Definitions

  • Embodiments of the present disclosure relate to the field of optical technologies, and in particular, to a quantum dot liquid crystal panel and a liquid crystal display device.
  • liquid crystal display devices As a display device with small radiation, low energy consumption, and light weight, liquid crystal display devices have been widely used. At present, not only computer monitors widely use liquid crystal displays, but also almost all televisions that provide multimedia broadcast services on the market are LCD TV. In order to improve the color gamut of the display, the related art uses a quantum dot conversion layer instead of the conventional color filter to realize display of a high color gamut.
  • a liquid crystal display device including: a light source mechanism, and a liquid crystal layer and a color conversion layer, the liquid crystal layer being provided with a plurality of interval sections, each of the plurality of interval sections being Each pixel unit of the color conversion layer corresponds to and is externally provided with a switch, and the two ends of the green pixel unit in the color conversion layer are adjacent to the red pixel unit; the two ends of the blue pixel unit are adjacent to the red pixel unit; One end of the red pixel unit is adjacent to the blue pixel unit, and the other end is adjacent to the green pixel unit.
  • a quantum dot liquid crystal panel including: a liquid crystal layer and a quantum dot conversion layer disposed on a light exiting side of the liquid crystal layer, wherein the liquid crystal layer is provided with a plurality of interval intervals, in the plurality of interval intervals
  • Each of the pixel units corresponding to the quantum dot conversion layer and externally disposed with a switch wherein the green pixel unit in the quantum dot conversion layer is adjacent to a red pixel unit; the blue pixel unit The two ends are adjacent to the red pixel unit; the red pixel unit is adjacent to the blue pixel unit at one end, and the green pixel unit is adjacent to the other end.
  • FIG. 1 is a schematic structural view of a direct type liquid crystal display device provided in the related art
  • FIG. 2 is a schematic structural diagram of a liquid crystal display device according to some embodiments of the present disclosure.
  • FIG. 3 is a schematic structural diagram of a direct type liquid crystal display device according to some embodiments of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a side-entry liquid crystal display device according to some embodiments of the present disclosure.
  • FIG. 5 is a graph showing a switching cycle of a backlight source and a pixel unit according to some embodiments of the present disclosure.
  • a direct type liquid crystal display device provided in the related art, as shown in FIG. 1, includes a blue backlight source 11, a color conversion layer 13, and a liquid crystal layer 12 disposed between the blue backlight source 11 and the color conversion layer 13.
  • the color conversion layer 13 is provided with a red pixel unit 131, a green pixel unit 132, and a transparent pixel unit 133, and each pixel unit is adjacent to two other pixel units, and the liquid crystal layer 12 includes a black matrix and a black matrix.
  • the black matrix forms a plurality of interval sections, each of which is provided with a liquid crystal material, and a switch is disposed outside, and each interval corresponds to one unit of the color conversion layer 13, and the switch may be a driving electrode or a thin film transistor.
  • TFT TFT
  • the blue backlight source 11 emits blue excitation light
  • the switch of the interval of the liquid crystal layer 12 corresponding to the red pixel unit 131 is turned on, the blue excitation light is irradiated to the red pixel unit 131 through the liquid crystal material, and the red pixel unit 131
  • the red quantum dot material absorbs the blue excitation light to emit light
  • the specific operation of turning on the switch is to apply a preset voltage on the TFT to change the liquid crystal molecules of the liquid crystal layer 12 from the opaque state to the transparent state.
  • the switch of the interval of the liquid crystal layer 12 corresponding to the green pixel unit 132 is turned on, the blue excitation light is irradiated to the green pixel unit 132 through the liquid crystal material, and the green quantum dot material in the green pixel unit 132 absorbs the blue excitation light and emits light. .
  • the switch of the interval of the liquid crystal layer 12 corresponding to the transparent pixel unit 133 is opened, and the blue excitation light passes through the liquid crystal material and is directly emitted from the transparent pixel unit 133.
  • FIG. 1 is a schematic structural diagram of a direct type liquid crystal display device according to some embodiments of the present disclosure.
  • the blue backlight source 11 is disposed directly below the display screen, and the direction in which the excitation light is emitted faces the screen.
  • the liquid crystal display device may be a side-entry liquid crystal display device.
  • the blue backlight source 11 of the side-entry liquid crystal display device is disposed in one of the devices. Side.
  • FIG. 2 is a schematic structural diagram of a liquid crystal display device according to some embodiments of the present disclosure.
  • a liquid crystal display device provided by some embodiments of the present disclosure adopts a “three-color four-pixel” color conversion layer and cooperates with two colors of excitation light to enable a large angle of exit of the backlight source. It is still guaranteed that the light of each color will not be crosstalked.
  • the "three-color four-pixel” means using a minimum combination comprising three colors so that the positions of the four sub-pixels can be occupied.
  • a liquid crystal display device includes: a light source mechanism 21 for providing a backlight, a liquid crystal layer 22, and a color conversion layer 23 disposed on a light exiting side of the liquid crystal layer 22.
  • the light source mechanism 21 is provided with a blue excitation light source 211 and A red excitation light source 212, wherein the blue excitation light source 211 is used to provide blue excitation light and the red excitation light source 212 is used to provide red excitation light.
  • the color conversion layer 23 is provided with a red pixel unit 231, a green pixel unit 232, and a blue pixel unit 233. Both ends of each of the green pixel units 232 are adjacent to the red pixel unit 231.
  • each of the blue pixel units 233 are also adjacent to the red pixel unit 231.
  • One end of each red pixel unit 231 is adjacent to the green pixel unit 232, and the other end is adjacent to the green pixel unit 232.
  • the green pixel unit 232 is provided with a green quantum dot material for receiving the blue excitation light of the blue excitation light source 211 to emit light;
  • the red pixel unit 231 is provided with a filter for the red excitation light. The light is emitted under illumination;
  • the blue pixel unit 233 is for transmitting the blue excitation light of the blue excitation light source 211 to obtain blue excitation light.
  • the blue pixel unit may be a transparent material, a mixture of a transparent material and a scattering material, and may also be a blue filter.
  • the liquid crystal layer 22 and the color conversion layer 23 are disposed in parallel with each other, and the width of each pixel unit of the color conversion layer 23 is the same as the width of the interval interval of the liquid crystal layer 22, which corresponds completely, wherein each interval interval
  • the liquid crystal material is contained therein and a switch is externally provided, and the switch may be a driving electrode or a TFT.
  • the green quantum dot material in the green pixel unit 232 is irradiated by the blue excitation light, and the green quantum dot material is excited by the blue excitation light.
  • Glowing since the two ends of the green pixel unit 232 are the red pixel unit 231, and the filter in the red pixel unit 231 passes only the red light, the light of other wavelengths is filtered out, so even if the blue excitation light exits the angle Larger, the red pixel unit 231 is irradiated, and is also filtered by the filter in the red pixel unit 231, so that crosstalk does not occur.
  • the blue excitation light illuminates the blue pixel unit 233 and is emitted from the blue pixel unit 233 to obtain blue excitation light.
  • the blue pixel unit 233 is also a red pixel unit 231 at both ends, and therefore, the blue excitation light is not crosstalked.
  • the red pixel unit 231 is illuminated by the red excitation light and exits through the filter in the red pixel unit 231 to obtain red excitation light. Since the red pixel unit 231 is respectively the green pixel unit 232 and the blue pixel unit 233, and the red excitation light has a longer wavelength than the green excitation light, even if the red excitation light exit angle is large, the green pixel unit 232 is irradiated.
  • the red excitation light also fails to excite the green quantum dot material to emit light, and even if the red excitation light is irradiated to the blue pixel unit 233, if the blue pixel unit is transparent, the resulting outgoing light is also red excitation light, if the blue pixel unit When a blue color filter is provided, the red excitation light that is emitted to the blue pixel unit is absorbed. Therefore, it will not be crosstalked.
  • the liquid crystal display device of the present disclosure does not suffer from crosstalk when each pixel unit is irradiated to a pixel unit adjacent to the target pixel unit even if the exit angle of the backlight source is large. The problem is that the color of the image displayed by the liquid crystal display device is corrected, thereby improving the user experience.
  • the blue pixel unit 233 can also transmit red excitation light, that is, the red excitation light can be emitted through the red pixel unit 231 and the blue pixel unit 233, The red excitation light is obtained, so that the light extraction efficiency of the red excitation light can be improved.
  • the green pixel unit 232 of the color conversion layer 23 is provided with a dichroic layer on the side facing the liquid crystal layer 22, and has reflection characteristics only for the green excitation light band, and for other wavelength bands.
  • Light has high permeability. Therefore, the blue excitation light can be directly transmitted, and the blue excitation light excites the green quantum dot material to emit light. When scattering toward the liquid crystal layer 22, it is reflected to the screen direction and reused, thereby improving the green excitation light. Light extraction efficiency.
  • FIG. 3 is a schematic structural diagram of a direct type liquid crystal display device according to some embodiments of the present disclosure.
  • the light source mechanism 21 is disposed opposite to the light incident surface of the liquid crystal layer 22, and an optical film assembly 24 and a diffusion plate 25 are disposed between the liquid crystal layer 22 and the light source mechanism 21, wherein the optical film The sheet assembly 24 is disposed adjacent to the liquid crystal layer 22, and the diffusion plate 25 is disposed adjacent to the light source mechanism 21.
  • the specific structure of the light source mechanism 21 and the color conversion layer 23 is as shown in FIG. 2, and the detailed description is made with reference to the embodiment shown in FIG. 2, some embodiments of the present disclosure. Not to repeat.
  • the diffuser plate 25 is used to homogenize the excitation light of the light source mechanism 21, and the optical film assembly 24 is used to increase the brightness of the homogenized excitation light.
  • the specific structure and function of the diffuser plate 25 and the optical film assembly 24 are well known to those skilled in the art, and some embodiments of the present disclosure will not be described herein.
  • FIG. 4 is a schematic structural diagram of a side-entry liquid crystal display device according to some embodiments of the present disclosure.
  • a liquid crystal is provided.
  • the light incident surface of the layer 22 is sequentially provided with an optical film assembly 24, a light guide plate 26, and a reflection sheet 27, wherein the light source mechanism 21 emits excitation light from the side of the light guide plate 26 toward the light guide plate 26.
  • the specific structure of the light source mechanism 21 and the color conversion layer 23 is as shown in FIG. 2, and the detailed description is made with reference to the embodiment shown in FIG. 2, and some embodiments of the present disclosure are not described again.
  • the light guide plate 26 is used to guide the uniform distribution of the excitation light of the light source mechanism 21, and the reflection sheet 27 is used to reflect the light emitted from the light guide plate 26 to the direction of the light guide plate 26.
  • the specific structure and function of the light guide plate 26 and the reflection sheet 27 are well known to those skilled in the art, and some embodiments of the present disclosure will not be described herein.
  • the liquid crystal display device of some embodiments of the present disclosure uses a color conversion layer of “three colors and four pixels” and cooperates with the excitation light of two colors, even if the exit angle of the backlight source is large, and the target pixel unit is irradiated.
  • colors other than the target color are not generated, so that each color is not crosstalked, so that the color of the image displayed by the liquid crystal display device is corrected, thereby improving the user experience.
  • some embodiments of the present disclosure further provide a display method, which can be implemented by a program controlling a liquid crystal display device, and the program can be carried by a chip or a single chip microcomputer or the like. Some embodiments of the present disclosure are not described herein again.
  • the method specifically includes: when the blue excitation light source 211 is turned on, the red excitation light source 212 is turned off; when the red excitation light source 212 is turned on, the blue excitation light source 211 is turned off.
  • the switch of the interval corresponding to the green pixel unit 232 on the liquid crystal layer 22 is turned on, and the switch of the interval corresponding to the blue pixel unit 233 on the liquid crystal layer 22 is turned off; or, the liquid crystal layer 22
  • the switch corresponding to the green pixel unit 232 is turned off, and the switch of the interval section corresponding to the blue pixel unit 233 on the liquid crystal layer 22 is turned on.
  • the switch of the interval section corresponding to the red pixel unit 231 on the liquid crystal layer 22 is turned on.
  • a display period may be set in advance, which is a time period in which light of three colors is sequentially and completely displayed.
  • the trigger blue excitation light source 211 emits blue excitation light during the first 2/3 of the display period, and controls the switch corresponding to the green pixel unit 232 on the liquid crystal layer 22 at 2/3.
  • any one of 1/3 of the time period is turned on, and the switch corresponding to the blue pixel unit 233 on the liquid crystal layer 22 is controlled to be turned on for another 1/3 of the period of 2/3.
  • the red excitation light source 212 is triggered to emit red excitation light during a period of 1/3 of the preset display period, and the switch corresponding to the red pixel unit 231 on the liquid crystal layer 22 is controlled to open in the second 1/3 period.
  • the switching period of the interval section on the liquid crystal layer and the switching period of the backlight source have corresponding timing relationships.
  • the switch corresponding to the blue pixel unit 233 and the green pixel unit 232 on the liquid crystal layer 22 may be controlled as needed. At the same time, it is turned on, thereby exciting the blue pixel unit 233 and the green pixel unit 232 to emit light at the same time.
  • the foregoing description of the preset period is merely an optional embodiment of the present disclosure, and is not limited to some embodiments of the present disclosure.
  • the present disclosure may also exchange green in the first 2/3 period.
  • the display order of the pixel unit 232 and the blue pixel unit 233, or the blue excitation light source 211 and the red excitation light source 212 are displayed at other time periods. In other embodiments, some embodiments of the present disclosure are no longer Detailed.
  • the red excitation light source and the blue excitation light source may also be illuminated simultaneously, and the deflection of the liquid crystal molecules in the liquid crystal layer is controlled according to the image to be displayed.
  • the liquid crystal display device of some embodiments of the present disclosure is also provided with a light source mechanism, and a liquid crystal layer and a color conversion layer disposed in parallel with each other, however.
  • the light source mechanism provides two kinds of excitation light, blue excitation light and red excitation light
  • each green pixel unit of the color conversion layer is a red pixel unit; two ends of each blue pixel unit are adjacent to each other.
  • Each is a red pixel unit; each red pixel unit is adjacent to a blue pixel unit at one end and a green pixel unit adjacent to the other end.
  • the green pixel unit is provided with a green quantum dot material for receiving excitation of the blue excitation light to emit light
  • the red pixel unit is provided with a filter for filtering out light other than the red excitation light.
  • the blue excitation light is emitted from the blue pixel unit to obtain blue excitation light, and the two ends of each blue pixel unit are also red pixel regions, so that the blue excitation light does not generate color.
  • Crosstalk When the red excitation light illuminates the red pixel unit, since the red pixel unit is respectively a green pixel unit and a blue pixel unit, and the red excitation light has a longer wavelength than the green excitation light, the red excitation light cannot excite the green quantum.
  • the point material emits light.
  • the red excitation light is irradiated to the blue pixel unit, if the blue pixel unit is transparent, the resulting emitted light is also red excitation light, and if the blue pixel unit is provided with a blue color filter Then, the red excitation light that is emitted to the blue pixel unit is absorbed, so the red color is not crosstalked by other colors.
  • the present disclosure does not generate a color other than the target color when the pixel unit adjacent to the target pixel unit is irradiated even if the exit angle of the backlight source is large, so that each color is It is not crosstalked, so that the color of the image displayed by the liquid crystal display device is corrected, thereby improving the user experience.
  • the present disclosure also provides a quantum dot liquid crystal panel comprising: a liquid crystal layer and a quantum dot conversion layer disposed on a light exiting side of the liquid crystal layer, wherein the liquid crystal layer is provided with a plurality of interval intervals, each of the plurality of interval intervals Corresponding to each pixel unit of the quantum dot conversion layer and externally provided with a switch, wherein two ends of the green pixel unit in the quantum dot conversion layer are adjacent to a red pixel unit; A red pixel unit is disposed; one end of the red pixel unit is adjacent to the blue pixel unit, and the other end is adjacent to the green pixel unit.
  • the green pixel unit in the quantum dot liquid crystal panel is provided with a green quantum dot material to be excited to generate green fluorescence;
  • the red pixel unit is provided with a red filter to transmit red light in the backlight and absorb other The light of the color;
  • the blue pixel unit is provided with a transparent material that transmits all of the light in the backlight.
  • the green pixel unit in the quantum dot liquid crystal panel is provided with a green quantum dot material to be excited to generate green fluorescence;
  • the red pixel unit is provided with a red filter to transmit red light in the backlight and absorb other The light of the color;
  • the blue pixel unit is provided with a blue filter to transmit the blue light in the backlight and absorb the light of other colors.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention concerne un panneau à cristaux liquides à points quantiques, et un dispositif d'affichage à cristaux liquides. Le dispositif d'affichage à cristaux liquides comprend un mécanisme de source lumineuse (21), une couche de cristaux liquides (22), ainsi qu'une couche de conversion de couleur (23). La couche de cristaux liquides (22) est pourvue d'une pluralité de sections d'intervalle, chaque section de la pluralité de sections d'intervalle correspondant à chaque unité de pixel dans la couche de conversion de couleur (23) et étant dotée extérieurement d'un commutateur. Dans ladite couche de conversion de couleur (23), une unité de pixel rouge (231) est adjacente aux deux extrémités d'une unité de pixel vert (232). L'unité de pixel rouge (231) est adjacente aux deux extrémités d'une unité de pixel bleu (233). L'unité de pixel bleu (233) est adjacente à une extrémité de ladite unité de pixel rouge (231), et l'unité de pixel vert (232) est adjacente à l'autre extrémité de cette unité de pixel rouge (231). Par rapport à l'état de la technique connexe, dans la solution, même si un angle de sortie d'une source de rétroéclairage est important, aucune diaphonie chromatique ne se produit lorsque des unités de pixel adjacentes à une unité de pixel cible sont exposées à la lumière, de telle sorte que la couleur d'une image affichée par un dispositif d'affichage à cristaux liquides soit corrigée, et l'expérience utilisateur d'un utilisateur peut ainsi être améliorée.
PCT/CN2018/072994 2017-07-24 2018-01-17 Panneau à cristaux liquides à points quantiques, et dispositif d'affichage à cristaux liquides Ceased WO2019019570A1 (fr)

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CN108303823A (zh) * 2018-01-25 2018-07-20 惠州市华星光电技术有限公司 背光模组及显示装置
CN115728982B (zh) * 2022-11-02 2024-03-08 厦门天马微电子有限公司 显示模组及显示装置

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